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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 判断星期几
        var day = new Date().getDay()
        // console.log(day)
        switch (day) {
            case 1:
                console.log('星期一')
                break;
            case 2:
                console.log('星期二')
                break;
            case 3:
                console.log('星期三')
                break;
            case 4:
                console.log('星期四')
                break;
            case 5:
                console.log('星期五')
                break;
            case 6:
                console.log('星期六')
                break;
            default:
                console.log('星期日')
                break;
        }
    </script>
</body>

</html>